Power transmitter



July 21, 1936. H. J. GOOSMAN Y POWER TRANSMITTER Filed March 22, 1935 Patented July 21, 1936 UNITED STATES POWER TRAN SIVHTTER Herbert J. Goosman, Elizabeth, N. J., assignorto The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application March 22,

Claims.

This invention relates to power-transmitters, more particularly of the treadle-controlled clutch and brake type commonly used on power benches for driving sewing machines, and has for an object to provide a power-transmitter of simplified and compact construction in which frictional losses are reduced to a minimum and which operates to pick up the driven load quickly and Without noise or chatter.

With the above and other objects in view, as will hereinafter appear, the=invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawing of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

, In the'accompanying drawing, Fig. 1 is a longitudinal vertical sectional view of an electric 20 power-transmitter embodying the invention. Fig. 2 is a back face view on a reduced scale of the live clutch-element of the transmitter. Fig. 3 is a section on the line 3-3, Fig. 2, and Fig. 4 is an outer end-face view of the driven disk on a reduced scale. I

i represents the laminated stator or field frame on an electric motor which is mounted as usual between a pair of end-bonnets, one of which is shown at 2, having attaching feet, one of which is shown at 3, whereby the motor may be mounted on the under side of the top board of a powerbench carrying amachine or other device to be driven.

4 represents the rotor of the motor which is fixed to the power-shaft 5 having a shoulder at 6 within the bearing pocket I in the end-bonnet 2 through which the outboard projection 5' of the motor-shaft extends.

Clamped in stacked relation upon the outboard projection 5" of the motor-shaft and against the shoulder washer 6, are the following elements in the order named, to wit: first, the'inner grooved race-ring 8 of a conventional ball-bearing; secand, the hub 9 of the live clutch-element III in the form of a. heavy fiy-wheel; third, the inner grooved race-ring ll of a second conventional ball-bearing; fourth, a spacing collar I2; and fifth, the inner grooved race-ring l3 of a third conventional ball-bearing; all of which parts are clamped upon the power-shaft extension 5 by means of the clamping nut l4 screwed onto the threaded end 5" thereof. The live clutch-element H] is also fixed on the shaft extension 5' by the usual key or spline I5. The three conven- 1935, Serial No. 12,448

tional ball-bearings referred to also respectively include the outer grooved race-rings 8', II and I3 with the usual balls I6 between the respective pairs of rings.

The' first ball-bearing 8, 8' is seated in the pocket 1 of the motor end-bonnet 2 and constitutes one of the main motor-shaft bearings.

Slidably mounted on the outer race-rings II' and I3 of the spaced coaxial second and third ball-bearings is the cup-shaped hub ll of the 10 driven clutch-disk [8 which is formed with a belt-pulley groove l9 and a flat clutch-face 20. The live clutch-element I0 has connected thereto by rivets 2| and driving pins 2|" the frictionclutch ring 2| of any suitable clutch facing ma- I terial backed in the present instance with a. thin layer of rubber 22 preferably vulcanized thereto. It is found that a thin rubber backing for the clutch facing 2| eliminates objectionable noise and chatter when the clutch-elements are engaged to pick up the load belted to the pulley I9.

The end-bonnet 2 is formed with an arm 23 J on which is fulcrumed at 24 the usual treadleoperated clutch-controlling and braking lever 25 having at its upper end the adjustably screwthreaded holder 26 for the oil-soaked wooden push-pin 21 applied centrally of the closed outer end-face ll of the driven pulley hub H. The lever 25 has pinned thereto the usual leather brake-shoe 28 applied to the rim 29 of the driven disk [8. The spring 30 between the lever 25 and its supporting arm 23 urges the lever 25 in a. direction to interrupt driving relation between the clutch-disks and to apply the brake 28 to the driven disk IS. The eyed end 3| of the lever 25 is to be connected by a suitable rod 32 to .an operating treadle (not shown). A spring-pressed plunger-pin 33 within a central hole in the free end of the shaft-extension 5 pushes against the inner end-wall of the cup-shaped hub ll of the driven clutch-element to carry the latter away from the driving element when the pressure of the push-pin 21 on the outer end-face I1 is relieved. r

Lubricant, such as conventional ball-bearing grease, may be introduced into the cup-shaped hub I! through the duct 34 normally closed by the screw-plug 35. The end-wall of the cupshaped hub I1 is provided with an air vent hole 35.

The hollow hub l I of the driven clutch-disk overlaps the hub 9 of the driving clutch-disk and there is preferably provided in the overlapping portion of the hub-member I! a lubricant-catching groove 31.

By slidably mountinQfthe cup-shaped hub of the driven clutch-member on the outer face ring or vrings of one or more conventional ballbearings, the inner ring or rings of which are fixed to thepower-shaft, certain important advantages are realized. First, a large sliding bearing surface area is provided with little or no relative rotary motion between the parts in sliding engagement. This practically eliminates wear between the slidably engaged parts and, at the same time, frictional losses are reduced to a minimum by the antifriction balls. Second, the lubricant within the cup-shaped hub cavity is thrown by centrifugal force toward the inner cylindrical wall thereof where the sliding engagement with the outer ball.- race rings occurs. Lubricant thrown toward the inner wall of the hub i1 is also picked up by the balls I 6 therewithin which are effectively lubricated.

By disconnecting the fulcrum-screw 24, and dropping the lever 25, the driven pulley element l8 may be readily removed and replaced by one of larger or smaller pulley diameter to meet any particular speed-requirements of the device to be driven.

The driving wheel [0 is preferably formed with radial fan vanes 38 and 39. The vanes 38 suck air through the holes 40 in the motor end-bonnet 2 and ventilate the motor. The vanes 39 ventilate 'the clutch by increasing the circulation of air be- I tween the driving and driven clutch faces; the air continuously running live clutch-element fixed to said" shaft, a ball-bearing carried by said shaft adjacent said live clutch-element and comprising inner and outer ball-race rings the inner of which is fixedin position upon said shaft, a driven clutch-member and belt-pulley slidably supported by the outer ball-race ring, and means for sliding said driven clutch-member upon said outer ball-race ring into working engagement with said live clutch-element.

2. Thecombination with a continuously running power-shaft and a live clutch-element fixed thereto, of spaced ball-bearings coaxial with and carried by said shaft, each of said ball-bearings comprising inner and outer ball-race rings and a series of balls between said rings, and a driven clutch-element having a hub slidably mounted on the outer race-rings of said ball-bearings.

-3. In an electric power-transmitter, a motor having a frame, a power-shaft journaled in said frame and having an outboard projection, a live clutch-element fixed to and carried by the outboard projection of said power-shaft, a pair of spaced conventional ball-bearings each having grooved inner and outer race-rings and a series of balls between said rings, the inner rings .of said ball-bearings being fixed in coaxially spaced relation upon the free end-portion of said powershaft, a driven clutch-member and belt-pulley freely slidable on the outer race-rings of said ballbearings, and means for sliding said driven clutch-member on said outer race-rings into working engagement with said live clutch-element.

4. In an electric power-transmitter, a motor having a frame, a power-shaft journaled in said frame and having an outboard projection, a live clutch-element having a friction clutch-face and a cylindrical hub fixed to' the outboard projection of said shaft, apair of spaced conventional ballbearings each having grooved inner andouter race-rings and a series of balls betweensaid rings, the inner rings of said ball-bearings being fixed in coaxially spaced relation upon the free end-portion of said power-shaft, a driven clutchmember and belt-pulley'having a hollow cupshaped hub freely slidable on the outer racerings -of said ball-bearings and overlapping the cylindrical hub of said live clutch-element, means for sliding said driven clutch-member on said ball-bearings into working engagement with said live clutch-element, and a lubricant-catching groove in the portion of said hollow hub which overlaps the hub of said live clutch-element.

5. In an electric power-transmitter, a motor having a frame including an end-bonnet and a shouldered power-shaft projecting outwardly ball-bearings and spacing collar being stacked upon said shaft in the following order, to wit: first, one of said ball-bearings, second, the live clutch-element, third, another of said ball-bearings, fourth, the spacing collar, and fifth, the third of said ball-bearings, a clamping nut 'on said shaft for holding the inner race-rings of said element.

HERBERT J. GOOSMAN.

CERTIFICATE OF CORRECTION. 5

Patent No. 2,048,501. July 21; 1956.

HERBERT J. GOOSMAN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, first column, line 42, claim 1, strike out the words "continuously running" and insert the same before power-shaft in line 41, same claim; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 8th day of September, A. D. 1956.

I Leslie Frazer Acting Commissioner of Patents. 

